The operation has involved major activity on land, sea and in the air in a demonstration of the force’s full power in case coalition action is needed.

It was formed in 2010 by the Lancaster House Treaty – enabling UK and France to deploy forces rapidly to conflict zones ahead of a wider NATO or other operation – or to meet peace-keeping, disaster relief or humanitarian needs.

“It will enable us to deploy rapidly with our French allies, helping to keep Britain safe while contributing to security in the world.”

A Eurofighter Typhoon jet

French Defence Secretary Jean-Yves Le Drian said: “France and the UK share common security interests. In order to face high level domestic and international threats it is now more than important to continue to strengthen our operational cooperation between our two countries.”

Aircraft including Typhoon and Rafale jets have operated from RAF Leeming in North Yorkshire, while at sea warships including HMS Ocean, Bulwark and Duncan will work off the south and west coast of England with French ships including FS Dixmude, FS Cassard and FF La Motte Piquet.

On Salisbury Plain the Army’s 3(UK) Division and French 7th Mechanised Brigade including paratroopers, armoured units and infantrymen, have worked together.

At the same time, more than 3,400 NATO troops from across Europe and the US are taking part in Exercise Joint Warrior, mostly off the coast of Scotland.